Drilling apparatus.



H. T. DUNBAR.

DRILLING APPARATUS.

APPLICATION FILED FEB. a, 1915.

2 SHEETS-SHEET l.

lNvENTuR A ATTURNEYEI.

Patented Mar. 14, 1916.

br @LMM \A/iTgEijEi W 7 g 40% H. T. DUNBAR.

DRILLING APPARATUS.

APPLICATION FILED FEB. 3, 1915.

Patented Mar. 14, 1916.

2 SHEETSSHEET 2.

INVENTUR A /1 a h x 9 m, AT T 1:! H N 5x51.

THE COLUMBIA PLANDGRAPH co.. WAsHmG'rofl, n. c.

l ldi TED STATE FFlQlZ;

HATE/BIS T. DUNBAR. OF BUFFALO, NE'W YORK.

DRILLING APEARATUS.

Application filed February 3, 1915.

To all 1072,0721 it may concern:

Be it known that I, HARRIS T. Dunnnn, a citizen of the United States,residing at Buffalo, in the county of Eri and State of New York, haveinvented new and useful improvements in Drilling Apparatus, of which thefollowing is a specification.

This invention relates to a drilling apparatus which is moreparticularly designed for drilling holes in rock which is submergedunder water. It frequently hapiens that the submerged body of rock intoich holes are to be drilled is covered more ss with mud, gravel or otherloose mawhich interferes with the drilling Operation on account of thetendency of the mud or, gravel to flow into the drill hole andpreventing the free escape of the pulverized roclfas the drillin )ro'resses.

The object of this invention is to provide an improved rock drillingapparatus having simple and efiic1ent means whereby the mud, gravel andthe like are held back and ,prevented from entering the hole which isbeing drilled in the rock and also means for washlng away the mud,gravel or the l1ke which may be deposited on the rock immediately abovethe place where the hole is being drilled and to also removethepulverized rock due to drilling the hole in the same, so that thedrilling operation can be effected more rapidly and economically.

In the accompanying drawings: Figure 1 is a side elevation of a drillingapparatus mounted on a drill boat and embodying my improvements. Fig. 2is a front elevation of the same. Fig. 3 is a fragmentary verticaltransverse section, on an enlarged scale, of the drilling apparatuscontaining my invention. Figs. l and 5 are horizontal sections taken inthe correspondingly numbered lines in Fig. 3 and looking in thedirection of the arrows associated with these lines. Fig. 6 is afragmentary vertical section on an enlarged scale of the lower part ofthe drill bar guide and partition tube forming the inlet passage for theclearing fluid.

Similar characters of reference indicate corresponding parts throughoutthe several views.

My improved drilling apparatus may be mounted in any suitable manner sothat the same can be transported from one place to Specification ofLetters Patent.

Patented l-lliar. 14, T5916.

Serial No. 5,87e.

another as required, but as shown in Figs. 1 and 2 of the drawings thesame is mounted on a drill boat or scow 1 the usual and well known typecommonly employed for drilling and having derrick 2 for raising andlowering the drilling apparatus and associated parts. i

3 represents the drill bar which is usually arranged in an uprightposition and provided at its lower end with a bit 4: whereby a hole isdrilled in the body of rock 5 below the surface of the water upon whichthe boat floats. A vertically reciprocating movement is imparted to thedrill bar by any suitable means so that the drill bar is fed downwardlyas the hole which is being drilled in the rock increases in depth. Asshown in Figs. 1 and 2 of the drawings, this reciprocating movement iseffected by a motor 6 which is operatively connected with the upper endof the drill bar so as to im part a vertically reciprocating movement tothe same and which is mounted on the derrick so as to be capable ofvertical adjustment thereon, for instance, by means which comprise twohoisting lines or cables 7 passing with their intermediate parts aroundpulleys 8 on the upper, overhanging part of the derrick and connected atone of their ends with the motor 6 while the other ends of said cablespass around a hoisting drum 9 mounted on'the lower part of the derrick.Between its upper and lower ends the drill bar is guided in a cross bar10 on the lower overhanging part of the derrick, as shown in Figs. 1 and2, or by any other suitable means. As the bit gradually increases thedepth of the hole in the rock which is being drilled the drill bartogether with the motor associated therewith is lowered in the samemeasure for maintaining the bit in the proper working position relativeto the rock.

My improvements which are associated with the drill bar for keeping themud, gravel, &c., out of the drill hole and also washing away thepulverized rock due to the drilling operation are constructed asfollows: 11 represents a guide for the drill bar the same beingpreferably of tubular form and surrounding the lower part of the drillabove the bit thereof. The bore of this guide is of such diameter thatthe drill bar and bit are free to be moved vertically through the samewhen lowering the drill bar into its operative position in which itengages the surface of the rock or is withdrawn therefrom for'thepurpose of sharpening the bit of the drill bar or replacing the same bya sharp one when necessary. At its upper and lower ends the guide tubeis provided with upper and lower external collars 12, 13, the peripheryof the lower collar 13 being provided with a spiral groove 14 extendingfrom the upper end to the lower end thereof. Surrounding the guide tubeis a partition sleeve or tube 15 which engages its upper and lower endswith the periphery of said collars and thereby closes the outer side ofthe reduced central part 150 of the guide tube and the spiral groove inits lower collar, whereby a downwardly extending inlet passage for apressure fluid is formed between the guide tube and the partitionsleeve. The pressure fluid preferably consists of water and this issupplied by a tube or pipe 16 connected atits lower end with the upperend of the partition sleeve so as to empty into the upper end of theinlet passage while the upper end of the supply pipe may be connectedwith a pump or other suitable means for forcing water into this pipe. 17represents a shield or guard, preferably of tubular form, arrangedaround the lower parts of the drill bar, partition sleeve and guide tubeand having its upper end wide open while its lower end tapers downwardlyand has an opening in which a bearing ring 18 of steel or other hardmetal is secured by a screw joint, as shown, or by any other suitablemeans, so that this bearing ring is arranged below the lower ends of thepartition sleeve and guide tube. An outlet passage 19 is formed betweenthe shield or guard and the partition sleeve which extends upwardly fromthe lower end of the downwardly extending passage to the exterior of theshield or guard at the upper end thereof. This upwardly extendingoutlet'passage is preferably of spiral form and constructed by a spiralrib on'theinner side or bore of the tubular shield engaging with theperiphery of the partition sleeve, as shown in Fig. 3. The partitionsleeve is secured. in place within the spiral rib in any suitable mannerso that the same are retained in this relation and compelled to move upand down together. \Vhile raising and lowering the shield, partitionsleeve, guide tube and parts connected therewith the same are guided bymeans which may comprise two upright guide bars 20, 20 connected attheir lower end with brackets 21 projecting laterally from oppositesides of the shield at the upper end thereof and sliding in ways 22formed in the cross bar 10 of the derrick. Projecting laterally from theupper ends of the partition sleeve and over the upper end of the shieldis an annular deflector 23 which is preferably of upwardly flaring formand constructed integrally with the guide tube.

When using this drilling apparatus the supporting frame comprising theguide bars 20 and bracketsQl and parts mounted thereon is lowered in thewater, mud, gravel, &c.,

until the lower end of the guard rests onthe 7 surface of the rock inwhich a hole is to be drilled. During its passage downward through themud, &c., the water supplied by the pipe 16 passes downwardly throughthe passage between the drill bar guide and the tubular partition andinto the lower end of the tubular shield or guard, and thence upwardlythrough the passage between the partition and the tubular guard andescapes at the upper end of the latter to the exterior of the apparatus.As the water issues from the upper end of the guard or shield any mud,gravel or the'like which tends to fall into the path'of the submergedpart of the drilling apparatus is constantly washed upwardly and turnedlaterally outward by the deflector 23 which causes this 'material to beheld back and pile up around the place where the drilling apparatuspasses through the mud, &c., to the surface of the rock to be drilled.In addition to holding back the earthy matter from above, the submergedpart of the guard tube, partition and drill guide, the stream of waterissuing from the nozzle formed by the downwardly and upwardly extendingpassages causes any loose earthy matter or pulverized rock entering thelower end of the shield or guard through the. opening in the respectiveend of the guard from the drill hole to be carried upwardly anddischarged upon the top of the surrounding body of mud or rock. As thewater issues from the lower end of the downwardly extending passage, thesame has a. swirling or spiral motion or wedge action which is impartedto it by the spiral groove 14: in thelower collar of the drill bar guideand as the water passes through the upwardly extending passage 19, thelatter, owing to its spiral'formation, continues to impart the swirlingmotion to the water, whereby'the effect of the water for carrying mud,&c. upwardly out of the guard tube and its effect for holding back themud &c.

above the guard tube and associated parts is greatly lncreased. By meansof the spiral outlet passage 19 the material is lifted by ajgradualwedge action so that less power 1' is required for expelling the dirtthan reable to work more freely and rapidly when boring a hole in a rocksubmerged below water, mud and the like, inasmuch as interference offoreign matter with the operation of the bit is practically eliminated.

l claim as my invention:

1. A drilling apparatus comprising a vertical drill bar provided at itslower end with a bit and adapted to be reciprocated vertically forcausing the bit to form hole in the body to be drilled, a tubular guidein which the lower part of the drill bar slides, a tubular guardsurrounding said guide and adapted to rest at its lower end on thesurface of the body to be drilled and provided with an opening for thepassage of the drill bar and its bit, and means for conducting a streamof water downwardly to the lower end of the guard and from the lower endof the guard to the upper end thereof, comprising a partition tubearranged between the guide and the guard and forming with V the guide aninner inlet passage which communicates at its upper end with a fluid supply and opens at its lower end into the guard, and forming with saidguard an outlet passage which communicates at its lower end with thecorresponding end of the inlet passage and opens at its upper end to theexterior.

2. A drilling apparatus comprising a vertical drill bar provided at itslower endwith a bit and adapted to be reciprocated vertically forcausing the bit to form a hole in the body to be drilled, a tubularguide in which the lower part of the drill bar slides, a tubular guardsurrounding said guide and adapted to rest at its lower end on thesurface of the body to be drilled and provided with an opening for thepassage of the drill bar and its bit, and means for conducting a streamof water downwardly to the lower end of the guard and from the lower endof the guard to the upper end thereof, comprisin a partition tubearranged between the guide and the guard and forming with the guide aninner inlet passage which communicates at its upper end with a fluidsupply and opens at its lower end into the guard and forming with saidguard an outlet passage which communicates at its lower end with thecorresponding end of the inlet passage and opens at its upper end to theexterior, said outlet passage having a part thereof constructed ofspiral form.

3. A drilling apparatus comprising a vertical drill bar provided at itslower end with a bit and adapted to be reciprocated vertically forcausing the bit to form a hole in the body to be drilled, a tubularguide in which the lower part of the drill bar slides, a. tubular guardsurrounding said guide and adapted to rest at its lower end on thesurface of the body to be drilled and provided with an opening for thepassage of the drill bar and its bit, and means forconducting a streamof water down. *ardly to the lower end of the guard and from the lowerend of the guard to the upper end thereof, com prising a partition tubearranged between the guide and the guard and forming with the guide aninner inlet passage which con: municates at its upper end with a fluidsupply and opens at its lower end into the guard and forming with saidguard an outlet passage which communicates at its lower end with thecorresponding end of the inlet passage and opens at its upper end to theexterior, said outlet passage having a part thereof constructed ofspiral form and said inlet passage having a part thereof alsoconstruoted of spiral form.

l. A drilling apparatus comprising a vertical drill bar provided at itslower end with a bit and adapted to be reciprocated vertically forcausing the it to form a hole in the body to be drilled, a tubular guidein which the lower part of the drill bar slides, a tubular guardsurrounding said guide and adapted to rest at its lower end on thesurface of the body to be drilled and provided. with an opening for thepassage of the drill bar and its bit, means for conducting a stream ofwater downwardly to the lower end of the guard and from the lower end ofthe guard to the upper end thereof, and oefiector projecting laterallyfrom the upper end of said guide over the upper end of said guard.

5. A drilling apparatus comprising a drill bar provided at its lower endwith a bit, a tubular guide which receives said drill bar and which isprovided at its upper end with a laterally projecting deflector, atubular guard surrounding said guide and a partition arranged betweensaid guide and guard.

6. A drilling apparatus comprising a drill bar provided at its lower endwith a bit, a tubular guide which receives said drill bar and which isprovided at its lower end with an external collar having a spiral grooveextending from the upper to the lower end of said collar, a partitionsleeve surrounding said guide and engaging its upper and lower ends withthe upper and lower parts of said guide while its intermediate part isseparated therefrom for forming an inlet passage between these members,a fluid supply tube connected with the upper end of said inlet passage,and a tubular guard surrounding the partition and guide.

7. A drilling apparatus comprising a drill bar provided at its lower endwith a bit, a tubular guide which receives said drill bar and which isprovided at its lower end with an external collar having a spiral grooveextending from the upper to the lower end of said collar, a partitionsleeve surrounding said guide and engaging its upper and lower ends withthe upper and lower parts of said guide while its intermediate part isseparated therefrom for forming an inlet passage between these members,a fluid supply tube connected with the upper end of said inlet passage,a tubular guard surrounding the partition and guide and provided at itslower end with a bearing ring through which said drill bar projects.

8. A drilling apparatus comprising a drill bar provided at its lower endwith a bit, a tubular guide which receivessaid drill bar and which isprovided at its lower end with an external collar having a spiral grooveextending from the upper to the lower end of said collar, a partitionsleeve surrounding said guide and engaging its upper and lower ends withthe upper and lower parts of said guide while its intermediate part isseparated therefrom for forming an inlet passage between these members,a fluid supply tube connected with the upper end of said inlet passage,and a tubular guard surrounding the partition and guide and provided atits lower end with an opening through which the drill bar projects andprovided in its bore with a spiral rib engaging with the periphery ofthe partition and forming therewith a spiral outlet passage.

9. A drilling apparatus comprising a drill bar provided at its lower endwith a bit, a tubular guide which receives said drill bar and which isprovided at its lower end with an external collar having a spiral grooveextending from the upper to the lower end of said collar, a partitionsleeve surrounding said guide and engaging its upperand lower ends withthe upper and lower parts of said guide while its intermediate part isseparated therefrom for forming an inlet passage between these members,a fluid supply tube connected with the upper end of said upwardlyflaring deflector projecting laterally from the upper end of said guideover the upper end of said guard.

Witness my hand this 2nd day of February, 1915. a HARRIS TFDUNBAR."

Witnesses:

THEO. L. Porr, ANNA I-IEIGIs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

I Washington, D. C.

